Generator Sizing Guide

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1 Technical Data TD E Contents Description Page Table 1 Motor Load Reference Table 2 Non-Motor Load Reference Table 3 Surge Capability Table 4 Fuel Pipe Sizing Table 5 LP Vapor (LPV) Tank Sizing UPS Generator Compatibility Onsite Estimating Sheet System Capacity Load Calculator Worksheet NEC 2008, 220 Part IV Typical Generator/Transfer Switch Combinations NEC (700, 701, 702) Comparison Electrical Formulas Weights and Measures

2 Technical Data TD E Important Notice: This booklet is designed to familiarize estimators and installers with proper sizing guidelines for residential and commercial generators. The information is not comprehensive, nor does it replace or supercede any material contained in any of the written documents shipped with the equipment. This booklet should only be used in conjunction with the Owner s Manual, Installation Manual and other technical documents shipped with each product. Always read all accompanying documentation carefully before attempting to install any generator, transfer switch or related equipment. How To Use This Booklet: Within this booklet, you will find electrical load information, plus an outline of generator surge capability, fuel pipe sizing, liquid propane tank sizing, and UPS / generator compatibility. The worksheet pages can be removed from the book and photocopied to create additional Onsite Estimating Sheets for use with individual jobs. Safety Information: Proper sizing of the generator is crucial to the success of any installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load. When analyzing the electrical load, consult the manufacturer s nameplate on each major appliance or piece of equipment to determine its starting and running requirements in terms of watts, amps and voltage. When choosing the generator output for commercial or industrial applications, select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 40 kilowatts, select a 50 kw genset). A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future. For safety reasons, Eaton recommends that the backup power system be installed, serviced and repaired by an Eaton Authorized Service Dealer or a competent, qualified electrician or installation technician who is familiar with applicable codes, standards and regulations. It is essential to comply with all regulations established by the Occupational Safety & Health Administration (OSHA) and strict adherence to all local, state and national codes is mandatory. Before selecting a generator, check for municipal ordinances that may dictate requirements regarding placement of the unit (setback from building and/or lot line), electrical wiring, gas piping, fuel storage (for liquid propane or diesel tanks), sound and exhaust emissions. If you have a technical question regarding sizing or installation, contact Eaton s Technical Service Center toll free at during normal business hours (8 a.m. to 4 p.m. CST). 2

3 Technical Data TD E Table 1. Motor Load Reference AC & Heat Pumps Running Load Starting Load Description 1 Ton (12,000 BTU) 2 Ton (24,000 BTU) 3 Ton (36,000 BTU) 4 Ton (48,000 BTU) 5 Ton (60,000 BTU) 7.5 Ton (85,000 BTU) 10 Ton* (120,000 BTU) 10 Ton (120,000 BTU) 15 Ton* (180,000 BTU) 15 Ton (180,000 BTU) 20 Ton* (240,000 BTU) 20 Ton (240,000 BTU) 25 Ton (300,000 BTU) 30 Ton* (360,000 BTU) 30 Ton (360,000 BTU) 40 Ton* (480,000 BTU) 40 Ton (480,000 BTU) 50* Ton (480,000 BTU) 50 Ton (480,000 BTU) Hp General Residential Description Refrigerator pump, sump, furnace, garage opener Freezer, washer, septic grinder Running kw 240V 1Ø 208V 3Ø 240V 3Ø 480V 3Ø LR 240V 1Ø LR 208V 3Ø LR 240V 3Ø LR 480V 3Ø (x2) (x2) (x2) N/A N/A (x2) 30 N/A N/A (x2) 40 N/A N/A (x2) 50 N/A N/A Hp Running kw 120V 1Ø V 1Ø LR 240V 1Ø LR 120V 1Ø General 1 Hp Well & septic lift pump * For multiple motor configurations, sequence starting is assumed. kw kw Caution: Do not size the generator based on starting kw alone. You must compare LR Amps to generator surge capability (table #3). Size the generator by following the sizing instructions. 3

4 Technical Data TD E Table 2. Non - Motor Load Reference Residential Description Running Load* Running kw 120V 1Ø Electric heat per 1000 ft2 12 N/A 50 Heat pump elements per 1000 ft2 7 N/A 29 Dryer 5.5 N/A 23 Hot tub 10 N/A 50 Range oven/stove top per burner 8 N/A 30 Hot water 4.5 N/A 19 General lighting and receptacles per 1000 ft N/A Blow dryer N/A Dishwasher N/A Microwave N/A Toasters N/A Home Entertainment Center N/A Computer N/A Kitchen N/A Laundry N/A Commercial Please refer to equipment data plate and/or billing history for commercial details * Always check data plate for actual running amps. 240V 1Ø 4

5 Technical Data TD E Table 3. Surge Capability Generators (Operating at less than 3600 RPM) Rated Output (Running Amps) Commercial (LR 15% Voltage Dip) Residential (LR 30% Voltage Dip) Size (kw) 240V 1Ø 208V 1Ø 240V 3Ø 480V 3Ø 240V 1Ø 208V 1Ø 240V 3Ø 480V 3Ø 240V 1Ø 208V 1Ø 240V 3Ø 480V 3Ø N/A N/A N/A N/A N/A N/A Generators (Operating at 3600 RPM) 7 29 N/A N/A N/A 23 N/A N/A N/A 46 N/A N/A N/A 8 33 N/A N/A N/A 26 N/A N/A N/A 51 N/A N/A N/A N/A N/A N/A 31 N/A N/A N/A 63 N/A N/A N/A N/A N/A N/A 48 N/A N/A N/A 95 N/A N/A N/A N/A N/A N/A 52 N/A N/A N/A 102 N/A N/A N/A N/A N/A N/A 59 N/A N/A N/A 117 N/A N/A N/A N/A N/A N/A 63 N/A N/A N/A 125 N/A N/A N/A N/A N/A N/A 67 N/A N/A N/A 133 N/A N/A N/A N/A N/A N/A 73 N/A N/A N/A 145 N/A N/A N/A Note: All nominal ratings based upon LP fuel. Refer to specification sheet for NG ratings and deration adjustments for ambient temperature and altitude. 5

6 Technical Data TD E Table 4. Fuel Pipe Sizing Natural Gas (Values are maximun pipe run in ft.) Pipe Size (in) kw LP Vapor (Values are maximun pipe run in ft.) Pipe Size (in) kw LP LPG: 8.55 ft 3 /lb., 4.24 lbs./ gal., 2500 btu/ft. 3 LPG: 36.3 ft3 = 1 gal. Natural Gas 1 cubic foot = 1,000 BTU. 1 therm = 100,000 BTU. Gas consumption = 13,000-16,000 BTU per kw/hr. Pressure 1 inch mercury = inches water column. 1 inch Water Column = psi inches water column = 0.18 psi to 0.50 psi. Note: Pipe sizing is based on 0.5" H 2 O pressure drop. Sizing includes a nominal number of elbows and tees. Please verify adequate service and meter sizing. 6

7 Technical Data TD E Table 5. LP Vapor (LPV) Tank Sizing Vapor Withdrawal (Dimensions are given in inches) Tank Capacity Total (Gal.) Tank Capacity Useable (Gal.) Minimum Temp ( F) Tank Capacity (btu/hr.) Length Diameter Overall Ht , ,160 82, , ,840 97, , , , , , , , , , ,217, , , ,416, , , Load (kw) BTU / Hr LP Gal / Hr NG Ft 3 / Hr NG Therms/ HR 5 110, , , , , , , , , , ,035, , ,170, , ,200, , ,280, , ,550, , ,675, , ,800, , ,925, , ,050, , ,800, , ,100, , Gas Required For Common Appliances Appliance Warm Air Furnace Single Family Multifamily, per unit Hydronic Boiler, Space Heating Single Family Multifamily, per unit Hydronic Boiler, Space and Water Heating Single Family Multifamily, per unit Range, Free Standing, Domestic Built-In Oven or Broiler Unit, Domestic Built-ln Top Unit, Domestic Water Heater, Automatic Storage, 30 to 40 gal. Tank Water Heater, Automatic Storage, 50 gal. Tank Water Healer, Automatic Storage, Instantaneous 2 GPM 4 GPM 6 GPM Water Heater, Domestic, Circulating or Side-Arm Refrigerator Clothes Dryer, Type 1 (Domestic) Gas Fireplace Direct Vent Gas log Barbecue Gas light Incinerator, Domestic Approxlmate Input (btu/hr.) 100,000 60, ,000 60, ,000 75,000 65,000 25,000 40,000 35,000 50, , , ,000 35,000 3,000 35,000 40,000 80,000 40,000 2,500 35,000 Operating Cost Per Hour = NG Therms/HR x Cost of NG Therm Note: Tank BTU capacity and generator run times based upon maintaining a minimum tank fuel level of 20%. Tanks are typically filled to 80% full. Typical fuel consumption based on a generator 100% loaded. 7

8 Technical Data TD E UPS - GENERATOR COMPATIBILITY Passive (also referenced as standby or off-line) and Line- Interactive These technologies are most common for personal workstations and point of sale applications. They are typically single phase equipment with size ranges of 350 VA VA for passive and 500 VA to 5000 VA for line-interactive. Passive UPS s are the simplest type. Under normal conditions AC power passes straight through to the UPS load. When the input power supply goes outside of specifications, the UPS transfers the load from input power to the internal DC to AC power inverter. Passive UPS s do not correct for voltage or frequency deviations under normal operation. Line-interactive is similar to the passive technology except it has circuitry that attempts to correct for standard voltage deviations. Frequency deviations under normal power operation are not corrected. Equipment Notes: These devices tend to be electrically / harmonically very noisy. A single small UPS is not a significant concern, but applications with multiple UPS s can be problematic. Passive UPS technology typically has normal tolerances of 10-25% on voltage and 3 hertz on frequency. If the input source goes outside of these tolerances, the UPS will switch onto the UPS battery source. Some line-interactive units may have frequency tolerances factory set to 0.5 hertz. These units will need to have their frequency tolerance increased to a minimum of 2 hertz. Double-Conversion This technology is most common for critical load applications. Doubleconversion UPS s constantly rectify AC to DC and then invert the DC back into AC. This configuration results in an output that corrects for voltage and frequency deviations. There are single and three phase models covering small through large applications. Most UPS applications larger than 5000 VA use double conversion technology. This approach is also the preferred technology for generator applications. Equipment Notes: Double-conversion UPS s that are single phase or unfiltered three phase models tend to create a significant level of electrical/ harmonic noise. This is illustrated by harmonic current distortions that are greater than 35%. Minuteman UPS products could have current distortion of 8%. When three phase models are supplied with harmonic filters (current distortion less than 10%), this concern is no longer an issue. Generator Sizing Recommendation: Single phase models: Limit the total UPS loading to 25% of the generator capacity. Single phase Minuteman UPS models: Limit the total UPS loading to 50% of the generator capacity. Three phase models without filters (current distortion > 30%): Limit the UPS loading to 35% of the generator capacity. Three phase models with filters (current distortion < 10%): Limit the UPS loading to 80% of the generator capacity. Generator Sizing Recommendation: Limit the total UPS loading to 15% - 20% of the generator capacity. Supplier(s) Passive (Standby) Line-Interactive Double-Conversion Powerware 3000 series 5000 series 9000 series Minuteman UPS Enspire Enterprise Plus Endeavor APC Back-UPS Series Smart-UPS Series Symmetra Series Liebert PowerSure PST & PSP PowerSure PSA & PSI UPStation & Nfinity 8

9 Technical Data TD E Onsite Estimating Sheet Contractor Phone Fax Job Name Date Location VOLTAGE 120/240 1ø 120/208 3ø 120/240 3ø 277/480 3ø TYPE Natural Gas LP Vapor (LPV) ELEC. SERVICE 100 Amp 200 Amp 400 Amp 600 Amp Other Before installation contact local jurisdiction to confirm all requirements are met. Jurisdictions may vary. Eaton recommends contacting local authorities prior to installation. Loads: Look for heavy building loads such as refrigeration, air conditioning, pumps or UPS systems. Motor Load Table (Refer to Table 1) Use the following for sizing and determining generator kw. Device HP RA LRA kw Rnning (= HP) Starting kw Applications The QT Series does not meet the necessary requirements for the following applications: NEC 695 Fire Pumps NEC 700 Emergency Systems NFPA 20 Fire Pumps NFPA 99 Healthcare NFPA 110 Emergency Systems Reference Codes Related Codes and Standards: NEC 225 Branch Circuits and Feeders NEC 240 Overcurrent Protection NEC 250 Grounding NEC 445 Generators NEC 700 Emergency Systems NEC 701Legally Required Standby NEC 702 Optional Standby NFPA 37 Installation & Use of Stationary Engines NFPA 54 National Fuel Gas Code NFPA 58LP Gas Code Starting kw for HP < 7.5 starting kw = HP x 3 Starting kw for HP > 7.5 starting kw = HP x 2 Starting kw for loading with no listed HP, calculate HP based on running amps in the chart on the right Non-Motor Load Table (Refer to Table 2) Use the following for sizing and determining generator kw. Device Amps kw Transfer Switch Avalability Single Phase* Amps Service Entrance 100, 200, 400, 600, 800 Non-Service Entrance 50, 100, 200, 400, 600, 800 Three Phase Service Entrance 100, 225, 300, 400, 600, 800 Non-Service Entrance 100, 200, 300, 400, 600, 800 * Single Phase ATS s from Amp have intelligent load management standard. To Calculate kw 120 V 1ø Amps x 120/1000 = kw 240 V 1ø Amps x 240/1000 = kw 208 V 3ø (Amps x 208 x x PF) /1000 = kw 240 V 3ø (Amps x 240 x x PF) /1000 = kw Install notes: Suggested concrete pad minimum thickness of 4 with 6 overhang on all sides. Composite pad included with air-cooled products. Consult manual for installation recommendations. Consult local authority having jurisdiction for local requirements. 480 V 3ø (Amps x 480 x x PF) /1000 = kw Recommended Generator Size Refer to Generator Sizing Instructions on other side of this sheet. 9

10 Technical Data TD E Onsite Estimating Sheet Generator Sizing Instructions: There is not a single correct sizing solution. Following are several methods that, when mixed with good judgement, should result in an appropriately sized generator. Remember to consider load growth, seasonality, and effects of starting motors. As municipalities and states adopt the new 2008 NEC Electrical Code, there may be new sizing requirements, spelled out in the code book, which the installation technician must follow. Always check with the local inspection department to confirm which code cycle will affect your install. Never add Amps when sizing a generator. Convert Amps to kw and add kw to determine the required generator size. Power factors for various motor loads vary widely. Adding Amps without properly accounting for the power factor and/or mixing voltages will result in improperly sizing the generator. When motors start, they create a current surge that step loads the generator and creates a voltage dip. After selecting a generator, reference the generator s surge capability using table 3. Verify that voltage dip is adequate for the application. Most commercial applications should be limited to about 15% voltage dip and residential applications should be limited to a 30% voltage dip. Some applications utilize an uninterruptible power supply (UPS) to back up critical loads. Please read sizing guide for this load type. Measurement Method Use a clamp-on Amp meter or power analyzer to measure facility load levels. Clamp each leg separately and take the measurement during peak usage levels. 240V 1ø Applications: To determine peak usage in kw, add the highest Amp readings from the two legs, multiply by 120 and divide by 1,000. (L1 + L2)120 / 1000 Size the generator 10 to 20% larger than the peak measured load. 3ø Applications: Add the peak Amp readings from all three legs and divide by 3 to determine peak Amps. Multiply peak Amps by volts, multiply the result by (square root of 3), then divide by 1000 to convert Amps to kw. Peak Amps = (L1 + L2 + L3) / 3 kw = [(Peak Amps x Volts) x 1.732] / 1000* *Assumes power factor of 1.0 Size the generator 20 to 25% larger than the peak measured load. Peak Amps = Peak kw= Billing History Method Commercial Many commercial customers have a utility rate structure that has a peak demand charge. Using a year s worth of electric bills, size the generator 25% larger than the largest peak demand. Verify motor and UPS load compatibility: Peak Demand = Load Summation Method Enter running kw for all motor loads (except the largest) expected to run during peak load levels into table 6. Refer to table 1 for typical motor load sizes and electrical requirements. Enter kw for all non-motor loads expected to run during peak load levels into table 7. Refer to table 2 for typical residential loads and rules of thumb. Add the running motor load kw, non-motor load kw, and the starting kw of the largest motor load. Motor load running total (minus largest motor): (ref. table 6) Non-motor load total: (ref. table 7) Starting load from largest cycling motor: (ref. table 6) Total electrical loads: Select generator: Commercial (add 20 to 25% to total kw) Residential (add 10 to 20% to total kw) kw kw kw = kw Confirm that voltage dip is within acceptable limits by comparing motor LRA to generator surge capability (see table #3). Confirm UPS compatibility (see page 6). System Capacity Load Calculation If the local municipality or state you are in has adopted the 2008 NEC Code, you may be required to use this step. Article 702 of the 2008 NEC includes a new requirement for sizing (702.5B). If no other method for sizing is acceptable, sizing of the generator shall be made in accordance with Article 220 of the NEC. The system capacity estimating sheet will guide you through this process. Project Layout Ball Park Estimates (Do not use for final sizing) Estimate based on 60% service size: (commercial) 240 Volts, 1 Ø: Amps x.15 = kw 208 Volts, 3 Ø: Amps x.22 = kw 240 Volts, 3 Ø: Amps x.25 = kw 480 Volts, 3 Ø: Amps x.50 = kw Estimate based on 40% service size: (residential) 240 Volts, 1 Ø: Amps x.10 = kw 208 Volts, 3 Ø: Amps x.15 = kw 240 Volts, 3 Ø: Amps x.17 = kw 480 Volts, 3 Ø: Amps x.34 = kw Estimate based on square footage Fast food, convenience stores, kw = 50 kw + 10 watts/sq. ft. restaurants, grocery stores Other commercial applications kw = 30 kw + 5 watts/sq. ft. Square footage = Estimated kw = Amps to kw Rule of Thumb (assumes.8 pf) For 480 volt systems Amps = kw x 1.5 For 208 volt systems Amps = kw x 3.5 For 240 volt 3 Ø systems Amps = kw x 3 For 240 volt 1 Ø systems Amps = kw x 4 10

11 Technical Data TD E System Capacity Load Calculator Directions for Nec 2008, Article 220, Part Iv Optional Feeder and Service Load Calculations (RESIDENTIAL) NEC Reference Section Can Be Used For Dwelling Units Served by a single feeder conductor (generator) 120/240 volt or 208Y/120 volt service Ampacity of 100 amps or greater The calcultated load will be the result of adding (B) General Loads, and (C) Heating and Air-Conditioning Load Calculated neutral load determined by (Additional 70% demand factor can be taken for cooking appliances and dryers when tables and/or are used) General Loads General Lighting and General-Use Receptacles Calculate at 3 VA per square foot Use exterior dimensions of the home to calculate square footage do not include open porches, garages, or unused or unfinished spaces not adaptable for future use. Add 20-amp small appliance & laundry 1500 VA each Calculate the following loads at 100% of nameplate rating Appliances fastened in place, permanently connected or located on a specific circuit Ranges, wall-mounted ovens, counter-mounted cooking units (Tables & ) Clothes dryers not connected to the laundry branch circuit Water heaters Permanently connected motors not included in Heat & Air-Conditioning Load section Heating & Air-Conditioning Loads Include the largest of the following six selections (kva load) in calculation Air Conditioning and Cooling 100% of nameplate rating Heat Pumps Without Supplemental Electric Heating 100% of nameplate rating Heat Pumps With Supplemental Electric Heating 100% of nameplate rating of the heat pump compressor* 65% of nameplate rating of supplemental electric heating equipment If compressor & supplemental heat cannot run at the same time do not include the compressor Electric Space Heating Less than 4 separately controlled 65% of nameplate rating 4 or more separately controlled 40% of nameplate rating 40% of nameplate rating if 4 or more separately controlled units Electric Thermal Storage (or system where the load is expected to be continuous at nameplate rating 100% of nameplate rating Systems of this type cannot be calculated under any other section of (C) (A) (B) (C) (B) (B) (1) (B) (2) (B) (3) (B) (3) a (B) (3) b (B) (3) c (B) (3) d (B) (4) (C) (C) (1) (C) (2) (C) (3) (C) (4) (C) (5) (C) (6) Load Calculations General Lighting Load Small Appliance & Laundry Circuits General Appliances & Motors (100% rated load) Sum of all General Loads = Total General Load (VA) Apply Demand Factors First % Remainder of General 40% HEAT / A-C 100% 3 VA x ft² VA per circuit + Total general appliances Total general load (VA) = 10,000 VA (Total VA - 10,000) x.40 = Calculated General Load (VA) Largest Heat or A-C Load (VA) = TOTAL CALCULATED LOAD Converting VA TO kw (Single-phase applications with 1.0 power factor only) 1 kva = 1 kw 11

12 Technical Data TD E Worksheet NEC 2008, 220 Part IV Contractor Phone Fax Job Name Date Location Voltage (Circle) 240V -1Ø Fuel NG LPV Elec. Service 100 Amp 200 Amp 400 Amp Other NET SQUARE FOOTAGE General Loads Qty Rating (Load) Factor Loads (VA) General Lighting and General Use Receptacles 3 VA/ft² 100% Branch Circuits (1500 VA/ft²) Small Appliance Circuits (20 Amp) % Laundry Circuits % Fixed Appliances Full Current Rating Well 100% Sump Pump 100% Freezer 100% Microwave (Not counter-top model) 100% Disposal 100% Dishwasher 100% Range (See Table for multiple cooking appliances) 100% Wall-Mounted Oven 100% Counter-Mounted Cooking Surface 100% Water Heater 100% Clothes Dryer 100% Garage Door Opener 100% Septic Grinder 100% Other (list) 100% TOTAL GENERAL LOADS VA kw Heat / A-C Load A-C / Cooling Equipment 100% Heat Pump Compressor (if not included as A-C) Supplemental Electric Heat Electric Space Heating Less than 4 separately controlled units 4 or more separately controlled units System With Continuous Nameplate Load 100% Largest Heat / A-C Load (VA) VA kw General Loads 1st 10 kw of General Loads 100% kw 100% kw Remaining General Loads (kw) 40% kw 40% kw CALCULATED GENERAL LOAD (kw) kw LARGEST HEAT / A-C LOAD 100% kw kw TOTAL CALCULATED LOAD (Net General Loads + Heat/A-C Load) 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 65% 65% 40% Loads (kw) (VA 1,000) kw kw kw 12

13 Technical Data TD E Typical Single Phase Generator/Transfer Switch Combinations Air Cooled Generators Liquid Cooled Generators kw Transfer Switch kw Transfer Switch 8 EGS50L12 EGS50L12R 10 EGS50L12 EGS50L12R EGS100 EGS100SE EGS100L24R 14 EGS100 EGS100SE EGS100L24R 17 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE 20 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE 22 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE 25 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE 27 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE EGS400NSE 30 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE EGS400NSE 36 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE EGS400NSE 45 EGS100 EGS100SE EGS100L24R EGS200 EGS200SE EGS400NSE 48 EGS200 EGS200SE EGS400NSE 60 EGS200 EGS200SE EGS400NSE ATC, ATV and ATH switches 13

14 Technical Data TD E NEC (700, 701, 702) Comparison NEC Comparison Table to be used as a general guideline in determining the proper generator for specific applications. Refer to architectural documents for final selection. Scope Article 700 Emergency Article 701 Standby Article 702 Optional Standby Legally required life safety Legally required critical support (fire fighting, health hazards, etc) Protect property & facilities Equipment Approval For Emergency / (UL2200) For Intended Use / (UL2200) For Intended Use / (UL2200) / Not in 2008 Testing Witness Testing (on-sight) At install & periodically At install None Periodic Testing Yes Yes None Battery Maintenance Yes Yes None Maintenance Records Yes Yes None Load Testing Yes Yes None Capacity All Loads All loads intended to operate at one time All loads intended to operate at one time / Not in 2008 Other Standby Loads Allowed Yes with load shedding Yes with load shedding 2008 Yes with load shedding Peak Shaving Allowed Yes?? Yes Yes Transfer Switch Automatic Yes Yes No Equipment Approval For Emergency / (UL1008) For Standby / (UL1008) For Intended Use / (UL1008) Means to Permitt Bypass Yes No No Elect. Operated - Mech. Held Yes No No Other loads No Yes with load shedding N/A Max. Fault Current Capable Yes Yes Yes Signals (Audible & Visual) Derangement Yes / Standard common alarm Yes / Standard common alarm Yes / Standard common alarm Carrying Load Yes / Displayed at ATS Yes / Displayed at ATS Yes / Displayed at ATS Battery Charger Failed Yes Yes No Ground Fault Indication Yes (480V & 1000A) No No NFPA 110 Signaling Yes / Optional annunciator Yes / Optional annunciator No Signs At service Yes / Type & location Yes / Type & location Yes / Type & location At neutral to ground bonding Yes (if remote) Yes (if remote) Yes (if remote) Wiring kept independent Yes No No Fire protection (ref 700-9d) Yes (1000 persons or 75' building) No No Maximum power outage 10 sec 60 sec N/A Retransfer delay 15 min setting 15 min setting No Automatic starting Yes Yes No On-site fuel requirements 2 hours (see NFPA 110) 2 hours None Battery charger Yes Yes No Ground Fault Indication Only No No 14

15 Technical Data TD E Electrical Formulas To Find Known Values 1-Phase 3-Phase KILOWATTS (kw) Volts, Current, Power Factor E x I 1000 KVA Volts, Current E x I 1000 AMPERES kw, Volts, Power Factor kw x 1000 E E x I x 1.73 x PF 1000 E x I x kw x 1000 E x 1.73 x PF WATTS Volts, Amps, Power Factor Volts x Amps E x I x 1.73 x PF NO. OF ROTOR POLES Frequency, RPM 2 x 60 x Frequency RPM FREQUENCY RPM, No. of Rotor Poles RPM x Poles 2 x 60 RPM Frequency, No. of Rotor Poles 2 x 60 x Frequency Rotor Poles kw (required for Motor) Motor Horsepower, Efficiency HP x Efficiency RESISTANCE Volts, Amperes E I VOLTS Ohms, Amperes I x R I x R AMPERES Ohms, Volts E R E = VOLTS I = AMPERES R = RESISTANCE (OHMS) PF = POWER FACTOR 2 x 60 x frequency RPM RPM x Poles 2 x 60 2 x 60 x Frequency Rotor Poles HP x Efficiency E I E R 15

16 Technical Data TD E Weights and Measures U.S. Weights and Measures Linear Measurements 1 Inch = Centimeters 12 Inches = 1 Foot = Decimeters 3 Feet = 1 Yard = Decimeters 5.5 Yards = 1 Rod = Meters 40 Rods = 1 Furlong = Hectometers 8 Furlongs = 1 Mile = Kilometers Mile Measurements 1 Statute = 5,280 Feet 1 Scots = 5,952 Feet 1 Irish = 6,720 Feet 1 Russian = 3,504 Feet 1 Italian = 4,401 Feet 1 Spanish = 15,084 Feet Other Linear Measurements 1 Hand = 4 Inches 1 Link = 7.92 Inches 1 Span = 9 Inches 1 Fathom = 6 Feet 1 Chain = 22 Yards 1 Furlong = 10 Chains 1 Cable = 608 Feet Square Measurements 144 Square inches = 1 Square foot 9 Square feet = 1 Square yard 30 1/4 Yards = 1 Square rod 40 Rods = 1 Rood 4 Roods = 1 Acre 640 Acres = 1 Square mile 1 Square mile = 1 Section 36 Sections = 1 Township Cubic or Solid Measure 1 Cu. foot = 1728 Cu. inches 1 Cu. yard = 27 Cu. feet 1 Cu. foot = 7.48 Gallons 1 Gallon (Water) = 8.34 Lbs. 1 Gallon (U.S.) = 231 Cu. inches of water 1 Gallon (Imperial) = 277 1/4 Cu. inches or water Metric System Cube Measure (The unit is the meter = Inches) 1 Cu. Centimeter = 1000 Cu. Millimeters = Cu. Inches 1 Cu. Decimeter = 1000 Cu. Centimeters = Cu. Inches 1 Cu. Meter = 1000 Cu. Decimeters = Cu. Feet 1 Cu. Centimeter (Water) = 1 Gram 1000 Cu. Centimeter (Water) 1 Cu. Meter (1000 Liters) = 1 Metric ton = 1 Steer = Cu. Yards = 1 Liter = 1 Kilogram Measures of Weight (The unit is the gram = Ounces) 1 Milligram = Grains 1 Centigram = 10 Milligrams = Grains 1 Decigram = 10 Centigrams = Grains 1 Gram = 10 Decigrams = Grains 1 Dekagram = 10 Grains = Drams 1 Hectogram = 10 Dekagrams = Ounces 1 Kilogram = 10 Hectograms = Pounds 1 Myriagram = 10 Kilograms = Pounds 1 Quintal = 10 Myriagrams = Cwt. 1 Metric Ton = 10 Quintal = 2, Pounds 1 Gram = Drams 1 Dram = Grams Grains 1 Metric Ton = 2, Pounds Measures of Capacity (The unit is the liter = Liquid quarts) 1 Centiliter = 10 Milliliters = Fluid ounces 1 Deciliter = 10 Centiliters = 3.38 Fluid ounces 1 Liter = 10 Deciliters = 33.8 Fluid ounces 1 Dekaliter = 10 Liters = Bushel 1 Hectoliter = 10 Dekaliters = 2.84 Bushels 1 Kiloliter = 10 Hectoliters = Gallons Note: Kilometers 8 Miles x 5 = Miles or x 8 = Kilometers 5 16

17 Technical Data TD E Weights and Measures Metric System Prefixes A. Mega = 1,000,000 E. Deci = 0.1 B. Kilo = 1,000 F. Centi = 0.01 C. Hecto = 100 G. Milli = D. Deka = 10 H. Micro = Linear Measurement (The unit is the meter = Inches) 1 Centimeter = 10 Millimeters = Inches 1 Decimeter = 10 Centimeters = Inches 1 Meter = 10 Decimeters = Yards Feet 1 Dekameter = 10 Meters = Yards 1 Hectometer = 10 Dekameters = Yards 1 Kilometer = 10 Hectometers = Mile 1 Myriameter = 10,000 Meters Square Measurement (The unit is the square meter = Square Inches) 1 Sq. Centimeter 1 Sq. Decimeter = 100 Sq. Millimeters = Sq. Inches = 100 Sq. Centimeters = Sq. Inches 1 Sq. Meter = 100 Sq. Decimeters = Sq. Feet 1 Sq. Dekameter 1 Sq. Hectometer 1 Sq. Kilometer = 100 Sq. Meters = Sq. Yards = 100 Sq. Dekameters = 100 Sq. Hectometers (The unit is the Are = 100 Square Meters) 1 Centiare = 10 Milliares = Sq. Feet 1 Deciare = 10 Centiares = Sq. Yards 1 Are = 10 Deciares = Sq. Yards 1 Dekare = 10 Ares = Acres 1 Hektare = 10 Dekares = Acres 1 Sq. Kilometer = 100 Hektares = Sq. Mile Cubic Measure (The unit is the Stere = 61, Cubic Inches) 1 Decistere = 10 Centisteres = Cubic Inches 1 Stere = 10 Decisteres = Cubic Yards 1 Dekastere = 10 Steres = Cubic Yards Metric Designator and Trade Sizes Metric Designator Trade Size 3/8 1/ /4 1 1/ / / U.S. Weights & Measures / Metric Equivalent Chart In. Ft. Yd. Mile Mm Cm M Km 1 inch = x Foot = x Yard = x x x x 1 Mile = 63,360 5,280 1, ,609, , , Mm = x x Cm = x M = x Km = 39,370 3, , ,000, ,000 1,000 1 Scientific Notation: A way of expressing very large or very small numbers in a more compact format. Any number can be expressed as a number between 1 & 10, multiplied by a power of 10 (which indicates the correct position of the decimal point in the original number). Numbers greater than 10 have positive powers of 10, and numbers less than 1 have negative powers of 10. Useful Conversions / Equivalents 1 BTU Raises 1 Lb. of water 1 o F 1 Gram Calorie Raises 1 Gram of water 1 o C 1 Circular Mil = Sq. Mil 1 Sq. Mil = 1.27 Cir. Mils 1 Mil =

18 Technical Data TD E Notes 18

19 Technical Data TD E Notes 19

20 Technical Data TD E Generator and transfer switch products are supported by an unparalleled service network and sales force. 24 hour support 7 days a week. For Pre-Sale support contact Eaton s Technical Resource Center at ETN-CARE. For installation and technical support contact Eaton s Aftermarket Support team at Products are serviced by only factory certified contractors. Eaton generator and transfer switch products are backed by competitive warranties. For additional information or to place an order, contact your local Eaton representative or visit us at Eaton Corporation Electrical Group 1000 Cherrington Parkway Moon Township, PA United States 877-ETN-CARE ( ) Eaton.com 2009 Eaton Corporation All Rights Reserved Printed in USA Publication No. TD E August 2009 All other trademarks are property of their respective owners.

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